Fortunately for us, it's been when our inspector is there wondering why 80 PSI and zero air doesn't raise the clapper. And the time the DPV acted with smart logic- somehow it knew the attic low point wasn't drained, so when it broke, the DPV didn't trip and cause all that nasty water damage. We've replaced 4 of them so far. There's a special lube you get to apply to the actuator pin, and in areas of hard water like here, this might need to occur quarterly. PIA for our techies, can't think a maintenance guy would do it. And since they pay us to come in annually, and Vic wouldn't pay for the other three trips, we wrote em a letter advising of the local water problem. Wasn't important enough to them to pay us and lube (building went into the Bank by default) but it was important for us to note it and make the offer.
That low air pressure may help it trip faster, but it may well increase transit times. For max performance, I like the 4 second elec accel trip and a higher residual air supply preventing water from filling toward non-flowing pipes. Made some huge volume systems work quickly when you wouldn't have thought it would work at all. George L. Church, Jr., CET Rowe Sprinkler Systems, Inc. PO Box 407, Middleburg, PA 17842 877-324-ROWE 570-837-6335 fax g...@rowesprinkler.com -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Richard Mote Sent: Thursday, October 25, 2012 12:59 PM To: sprinklerforum@firesprinkler.org Subject: RE: trip time per nfpa 25 Was it a Victaulic #756 or #768? Look closely at the differential piston if it is a #756 some time they stick. Richard L. Mote ET NICET Cert. No. 067611 Designer Rowe Sprinkler Systems, Inc. 7993 Route 522, Suite 1 P.O. Box 407 Middleburg, PA 17842 P 570.837.7647 F 570.837.6335 -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Gregg Key Sent: Thursday, October 25, 2012 12:15 PM To: sprinklerforum@firesprinkler.org Subject: RE: trip time per nfpa 25 Very good feedback. This system was installed in 2006 and is a Victaulic dpv. We have none of the original acceptance test paperwork but would make an assumption that it would have passed then. It appears to be a small system. Mike ,you are right about the by-pass line as it appears that there is not one installed. Air Compressor is in a hidden crawl space below the floor. My thought was that something has restricted the air release in the inspectors test but have not taken it apart. Thanks for everyones help C.Gregg Key, SET Key Fire Protection Services,Inc Project Manager (O) 706-790-3473 (C) 706-220-8821 -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Mike Cabral Sent: Thursday, October 25, 2012 10:40 AM To: sprinklerforum@firesprinkler.org Cc: sprinklerforum@firesprinkler.org Subject: Re: trip time per nfpa 25 I would check to make sure that the air supply to the DPV is working as it should. The time to trip should never be that long. Is the by-pass open? Sounds like the make-up air is supplying to much air. The make up air needs to be restricted. The supply line to the Inspectors Test can be larger than 1" it can't be less than 1" however the standard does no say it can't be larger than 1". Sent from my iPhone On Oct 24, 2012, at 1:13 PM, Todd Letterman <tletter...@haifire.com> wrote: > It is also not going to trip or be severely delayed if there is a > water column occurrence holding the clapper shut. > > -----Original Message----- > From: sprinklerforum-boun...@firesprinkler.org > [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Ron > Greenman > Sent: Wednesday, October 24, 2012 11:06 AM > To: sprinklerforum@firesprinkler.org > Subject: Re: trip time per nfpa 25 > > I don't believe their is any reference to "how long is too long" > except in > 13 (pre 2010) where a system of between 500 & 750 gallons is required > to have a QOD if the water delivery time to the inspectors test exceeds 60 seconds. I think there is a presumption that a system of less than 500 gallons will trip in a "timely" manner, that over 750 gallons won't without a QOD, and that in between one is questionable. From there the one minute trip time came to be the conventional standard, although the book only referred to water delivery time after the trip occurred. In the 2010 edition times are specified. See section 7.2.3.6 Dry Pipe System Water Delivery. Although entitled as "water delivery time" it tells you that the delivery time countdown starts at normal air pressure which suggests pre-trip, tto the actual trip, and finishing with water at the test port. > > On Wed, Oct 24, 2012 at 10:27 AM, Gregg Key <gr...@keyfps.com> wrote: > >> Our inspector ask an interesting question today. How long is too long >> of a time for a dry valve to trip before it is considered a >> deficiency? 25 does not specify but 15 min seams too long. Don't have >> the previous report to compare it to. >> >> C.Gregg Key, SET >> Key Fire Protection Services,Inc >> Project Manager >> (O) 706-790-3473 >> (C) 706-220-8821 >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> Sprinklerforum@firesprinkler.org >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > > -- > Ron Greenman > Instructor > Fire Protection Engineering Technology Bates Technical College > 1101 So. Yakima Ave. > Tacoma, WA 98405 > > rgreen...@bates.ctc.edu > > http://www.bates.ctc.edu/fireprotection/ > > 253.680.7346 > 253.576.9700 (cell) > > Member: > ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC > > They are happy men whose natures sort with their vocations. -Francis > Bacon, essayist, philosopher, and statesman (1561-1626) > -------------- next part -------------- An HTML attachment was > scrubbed... > URL: > <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/atta > chments/20121024/57fe47b6/attachment.html> > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
